The supersonic gas-particle two-phase transverse jet is a typical flow process in many applications,such as solid rocket scramjet.This study carried out experimental tests as well as Large Eddy Simulation(LES)to inves...The supersonic gas-particle two-phase transverse jet is a typical flow process in many applications,such as solid rocket scramjet.This study carried out experimental tests as well as Large Eddy Simulation(LES)to investigate the evolution process of transverse gas-particle two-phase jets in supersonic crossflow,especially focusing on the phenomena called preferential concentration.The simulation is based on the Eulerian-Lagrangian method,which successfully reproduces the characteristic phenomena observed in experiments.The particle cloud forms three different characteristic distribution patterns:tooth-like waves near the jet port,quasi-ordered structures near counter-rotating vortex pairs(CVP),and filamentous clouds in the upper part.The turbulence and small unstable shock play a suppressing role in mixing small-diameter particles,which tend to aggregate in regions of high density and low vorticity.Furthermore,it is found that there exists a specific range of particle sizes,as particles'sizes approach this specific range,the influence of compressibility of the airflow on particle distribution becomes increasingly prominent.Overall,this study shed some light on the understanding of the complex and intricate nature of the supersonic gas-particle two-phase transverse jet.展开更多
There is notable variability in carbon emission reduction efforts across different provinces in China,underscoring the need for effective strategies to implement carbon emission allowance auctions.These auctions,as op...There is notable variability in carbon emission reduction efforts across different provinces in China,underscoring the need for effective strategies to implement carbon emission allowance auctions.These auctions,as opposed to free allocations,could be more aligned with the principle of“polluter pays.”Focusing on three diverse regions—Ningxia,Beijing,and Zhejiang—this study employs a system dynamics simulation model to explore markets for carbon emissions and green certificates trading.The aim is to determine the optimal timing and appropriate policy intensities for auction introduction.Key findings include:(1)Optimal auction strategies differ among the provinces,recommending immediate implementation in Beijing,followed by Ningxia and Zhejiang.(2)In Ningxia,there’s a potential for a 6.20%increase in GDP alongside a 21.59%reduction in carbon emissions,suggesting a feasible harmony between environmental and economic objectives.(3)Market-related policy variables,such as total carbon allowances and Renewable Portfolio Standards,significantly influence the optimal auction strategies but have minimal effect on carbon auction prices.展开更多
基金supported by the National Natural Science Foundation of China(grant Nos.12272409,T2221002)Changsha Science and Technology Project(grant No.kq2107001)+1 种基金the Science and Technology Innovation Program of Hunan Province(grant No.2022RC1233)Hunan Provincial Innovation Foundation for Postgraduate(grant No.QL20230015).
文摘The supersonic gas-particle two-phase transverse jet is a typical flow process in many applications,such as solid rocket scramjet.This study carried out experimental tests as well as Large Eddy Simulation(LES)to investigate the evolution process of transverse gas-particle two-phase jets in supersonic crossflow,especially focusing on the phenomena called preferential concentration.The simulation is based on the Eulerian-Lagrangian method,which successfully reproduces the characteristic phenomena observed in experiments.The particle cloud forms three different characteristic distribution patterns:tooth-like waves near the jet port,quasi-ordered structures near counter-rotating vortex pairs(CVP),and filamentous clouds in the upper part.The turbulence and small unstable shock play a suppressing role in mixing small-diameter particles,which tend to aggregate in regions of high density and low vorticity.Furthermore,it is found that there exists a specific range of particle sizes,as particles'sizes approach this specific range,the influence of compressibility of the airflow on particle distribution becomes increasingly prominent.Overall,this study shed some light on the understanding of the complex and intricate nature of the supersonic gas-particle two-phase transverse jet.
基金supported by the National Social Science Foundation of China(Grant No.22FGLB029)the National Nature Science Foundation of China(Grant Nos.72274094,72371129,71834003)+1 种基金Project of the Ministry of Education of China(Grant No.202200337)the Fundamental Research Funds for the Central Universities(Grant Nos.NR2021002 and NS2022074).
文摘There is notable variability in carbon emission reduction efforts across different provinces in China,underscoring the need for effective strategies to implement carbon emission allowance auctions.These auctions,as opposed to free allocations,could be more aligned with the principle of“polluter pays.”Focusing on three diverse regions—Ningxia,Beijing,and Zhejiang—this study employs a system dynamics simulation model to explore markets for carbon emissions and green certificates trading.The aim is to determine the optimal timing and appropriate policy intensities for auction introduction.Key findings include:(1)Optimal auction strategies differ among the provinces,recommending immediate implementation in Beijing,followed by Ningxia and Zhejiang.(2)In Ningxia,there’s a potential for a 6.20%increase in GDP alongside a 21.59%reduction in carbon emissions,suggesting a feasible harmony between environmental and economic objectives.(3)Market-related policy variables,such as total carbon allowances and Renewable Portfolio Standards,significantly influence the optimal auction strategies but have minimal effect on carbon auction prices.
